I could not find any over size or ones like willwood unless I went with a chevelle spindle. I did find cross drilled and slotted rotors I have on. I also went with this high power electric master cylinder. I did not have enough vacuum to run the power booster. With this combination it stops my truck with 20's and over 700 horse with NO problem.
Here is a link for more info on the master cylinder. They have one you can put on the firewall or on the frame so you do not see it. Good luck and welcome.
http://www.abspowerbrake.com/